mirror of
https://github.com/robbert-vdh/yabridge.git
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Robbert van der Helm
65 lines
2.9 KiB
C++
65 lines
2.9 KiB
C++
// yabridge: a Wine plugin bridge
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// Copyright (C) 2020-2022 Robbert van der Helm
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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#include "linking.h"
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#include <cassert>
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#include <dlfcn.h>
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namespace fs = ghc::filesystem;
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fs::path get_this_file_location() {
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// We'll try to find the library this function was defined in. When called
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// from a copy of `libyabridge-*.so` this will return that library. Because
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// the chainloader libraries load the plugin libraries from fixed locations,
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// the plugin libraries cannot use this function directly when using the
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// chainloaders.
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// On success this returns a non-zero value, just to keep you on your toes
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Dl_info info;
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assert(dladdr(reinterpret_cast<void*>(get_this_file_location), &info) != 0);
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assert(info.dli_fname);
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std::string this_file(info.dli_fname);
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// HACK: Not sure why, but `boost::dll::this_line_location()` used to return
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// a path starting with a double slash on some systems. I've seen this
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// happen on both Ubuntu 18.04 and 20.04, but not on Arch based
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// distros. Under Linux a path starting with two slashes is treated
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// the same as a path starting with only a single slash, but Wine will
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// refuse to load any files when the path starts with two slashes. The
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// easiest way to work around this if this happens is to just add
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// another leading slash and then normalize the path, since three or
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// more slashes will be coerced into a single slash. We no longer use
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// Boost.Dll, but unless this was an obscure Boost.Filesystem bug it
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// sounds more likely that it was caused by some `ld.so` setting.
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// Unless we can really figure out what was causing this, it seems
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// best to still account for it
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if (this_file.starts_with("//")) {
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const size_t path_start_pos = this_file.find_first_not_of('/');
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if (path_start_pos != std::string::npos) {
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// FIXME: This results in a spurious compiler warning if you inline
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// `path_start`:
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// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105329
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const std::string path_start = this_file.substr(path_start_pos);
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this_file = "/" + path_start;
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}
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}
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return this_file;
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}
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